id:A102347 - OEIS Search Results

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Omega(10^n - 1), where omega(n) is the number of distinct prime factors of n.

+0
2

1, 2, 2, 3, 3, 5, 3, 5, 3, 5, 3, 7, 4, 5, 6, 7, 3, 8, 2, 8, 7, 7, 2, 10, 6, 7, 5, 9, 6, 13, 4, 12, 6, 7, 8, 11, 4, 4, 6, 12, 5, 14, 5, 11, 9, 7, 3, 13, 5, 11, 8, 10, 5, 12, 9, 13, 6, 9, 3, 20, 8, 6, 13, 16, 8, 14, 4, 11, 6, 13, 3, 17, 4, 8, 12, 7, 9, 15, 7, 16, 10, 8, 4, 21, 8, 9, 10, 15, 6, 21, 13 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = omega(R_n) + n^2(mod 3) = A095370(n) + n^2(mod 3),{where R_n=(10^n-1)/9=A002275(n)},i.e. a(n) = A095370(n) for n=3k;otherwise a(n) = A095370(n) + 1. - Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 09 2006`
	CROSSREFS	`Cf. A001221, A070528.` `Sequence in context: A138305 A079375 A069933 this_sequence A069974 A039650 A039649` `Adjacent sequences: A102344 A102345 A102346 this_sequence A102348 A102349 A102350`
	KEYWORD	`nonn`
	AUTHOR	`Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Feb 20 2005`

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Last modified November 23 10:40 EST 2009. Contains 167421 sequences.

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